Update iPhone to the latest iOS version
Open Settings and check for unknown profiles or device management
Remove suspicious apps you do not recognize
Clear Safari history and website data
Check Safari extensions and disable anything unfamiliar
Review calendar subscriptions and delete unknown ones
Restart the iPhone
Reset network settings if you suspect malicious redirects
Change your Apple ID password
Enable two-factor authentication for your Apple ID
Run a security check in Settings for account and privacy alerts
Back up important data
Erase all content and settings if problems continue
Restore only trusted apps and data after reset
Contact Apple Support if you still suspect malware